mactel-support team mailing list archive

[Daniel Graziotin <daniel.graziotin@xxxxxxxxx>]

I think I managed to got it working:


dmesg|grep -i ahci
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.38.8-dg root=UUID=a62afe8f-9e3c-445c-bfdb-4e1c1bc82232 ro crashkernel=384M-2G:64M,2G-:128M i5s_3400s_force_ahci=1 quiet splash vt.handoff=7
[    0.671966] [i5s_3400s ** FIXUP] SATA controller mode: NON AHCI (0x3c00)
[    0.671967] [i5s_3400s ** FIXUP] Putting SATA controller into AHCI (0x3c60)
[    1.294111] ahci 0000:00:1f.2: version 3.0
[    1.294138] ahci 0000:00:1f.2: PCI INT B -> GSI 19 (level, low) -> IRQ 19
[    1.294198] ahci 0000:00:1f.2: irq 41 for MSI/MSI-X
[    1.294271] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 4 ports 3 Gbps 0x3 impl SATA mode
[    1.294275] ahci 0000:00:1f.2: flags: 64bit ncq sntf pm led clo pio slum part ems apst 
[    1.294280] ahci 0000:00:1f.2: setting latency timer to 64
[    1.300513] scsi0 : ahci
[    1.300650] scsi1 : ahci
[    1.300730] scsi2 : ahci
[    1.300801] scsi3 : ahci

Can you confirm is using AHCI? Suspend works.

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https://bugs.launchpad.net/bugs/817017

Title:
  AHCI mode not restored during sleep-wakeup cycle

Status in Mactel Support:
  In Progress

Bug description:
  The SATA controller operates by default in IDE mode and there is no known EFI setting to override this behavior. Fortunately, it can be put into AHCI mode before the Linux kernel is booted (e.g. by Grub2 *) ).
  SSD disks perform much better in AHCI mode. On my laptop, both Intel SSD 320 and a Cruzial RealSSD C300 performed great in the beginning, but system responsiveness degraded soon to a point where system load was around 6 to 7 during updates (apt-get dist-upgrade) and second long freezes during normal work (e.g. browsing, responding to emails, heck - even when using vim in a terminal! ...).

  Unfortunately there is a drawback when putting the SATA controller into AHCI mode: AHCI is not restored during sleep-wakeup cycles and thus the system crashes badly after wakeup, because it suddently finds only an IDE controller.
  We need to patch (e.g. the SATA driver?) and check which mode the controller had been in, before the laptop was sent to sleep and restore the previous mode.

  *) How to put the SATA controller into AHCI mode [1]:
  MBP 6,2 (or any other 5 series/3400 series chipset based MBP)
  put this line before 'set root=...':
  setpci -d 8086:3b28 90.b=60
  (that command sets bit 5 and 6 on register 0x90 -- lookup Intel document number 322169 for details)

  [1] http://en.gentoo-wiki.com/wiki/Apple_Macbook_Pro

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